LAB ARTHROPOD GROUPS1 Characters of Arthropoda Bodies appendages

LAB ARTHROPOD GROUPS-1

Characters of Arthropoda: ØBodies & appendages (legs, mouth parts, antennae and genitalia) are segmented. ØBody walls are made up of a complicated saccharine & proteins secretion (non-living materials called chitin) which is resistant to water lose, to grow the animal mast be molt.

Adult (male & female) Pupa or nymph in some groups Eggs Larva

Phylum: Arthropoda 4 medical important Classes Myriapoda Crustacia Arachnida Insecta

I. Class Myriapoda: § § § The most primitive, Elongated bodies, Many segments, Many legs With antennae & chewing mouthparts. A. Diplopoda (millipeds )ﺧﺎﺗﻢ ﺳﻠﻴﻤﺎﻥ B. Chilipoda (centipeds )ﺍﻡ ﺳﺒﻌﺔ ﻭﺳﺒﻌﻴﻦ

A. Diplopoda (millipeds ﺧﺎﺗﻢ )ﺳﻠﻴﻤﺎﻥ : v. Many segments, v. Segments circular, v. Two pairs of legs per segment, v Live on plant materials in gardens (herbaceous) v. Body covered with minute hairs & glands, v. If bothered either spray poisoning secretions or through hairs or both, causing sensitivity, rash, swelling but not killing.

2 pairs of legs - segment Antennae Body segments

Chilipoda (centipeds )ﺍﻡ ﺳﺒﻌﻪ ﻭﺳﺒﻌﻴﻦ : v. Many broad segments, v. One pair of legs in each segment, v. Predacious on other small arthropods, v. Provided with poison glands, v. First pair of leg modified into claws to inject poison Claws v. Painful bite may be killing. 1 pair of legs -segment

II. Class Crustacia q Mostly aquatics, like prakin = ﺭﻭﺑﻴﺎﻥ crab = ﺍﺑﻮ ﺍﻟﺠﻨﻴﺐ …. etc, q Very important as protein foods for people who live on sea or ocean shores. q Body are of two (some times three) regions, one pair of legs in each segment. q The body regions are cephalothoraxes and abdomen. q Legs are modified to function in feeding, walking, swimming & meeting. q One order which is terrestrial called saw bugs.

q. Medically the important spp. belong to copepod, small aquatic called water flea. q. The genus Cyclops is the transmitter (vector) of nematodes Dracunculus medinensis ,

Water flea (Cyclops) or copepod

III. Class Archanida ( )ﺍﻟﻌﻨﻜﺒﻮﺗﻴﺎﺕ ülike spiders, scorpions, ticks & mites. üThey are characterized by having: A. 2 body regions…… cephalothorax & abdomen. B. In adult 4 pairs of legs, on the cephalothorax. No appendages on abdomen. C. No sensory antennae. D. Mouth parts all of sucking types (piercing, cutting, rupturing and then sucking). mouth parts composed of chelicerae & peripoda.

A. Order : Aranida (Spiders) Ø Ø Ø Terrestrial & predacious. The abdomen joins to the cephalothorax by a narrow pedicel. All spiders are poisonous and silk producing, But very few of them are dangerous, or even killing. The black widow is the dangerous group.

B. Scorpions: v. Large to medium, v. Two body regions, v. Two modified clasping peripoda, v. Cephalothorax with 4 pairs of legs, v. Chelicerae small. v. The abdomen of two parts: a. wide anterior portion b. narrow, long posterior portion ending with sting needle and a poison gland.

Al- Jarrar scorpion: • Found in the eastern • of Zagros Mountain, Khanaquin, Mendili, Badrah, Jassan and down to Ahwaz (Iran). • The scorpion when moving draws the tail behind and not having it stand on the ready. • Very dangerous, may kill children or leave a large spot….

2. The black scorpion: §Large, §All over Iraq, §Black and dangerous. §There are mentions of killing children and even adult in Iraq.